I think that we will be very surprised when and if we ever find out. I wouldn't be surprised if it is someone quite famous. Any guesses? My gut feeling is that it is someone who is supposed to be "dead":
JFK jr Tom Clancy (My No 1 choice) John McAfee
Any thoughts?
My thought is that it is AI attached to Project Looking Glass.
In other words, a super-computer. Or, at least that's what created the content and clues, and then maybe a person put it out there.